| Code Display | Malfunction Name |
|---|---|
| E1 | High pressure protection of system |
| E2 | Antifreezing protection |
| E3 | System block or refrigerant leakage |
| E4 | High discharge temperature protection of compressor |
| E5 | Overcurrent protection |
| E6 | Communication Malfunction |
| E8 | High temperature resistant protection |
| EE | EEPROM malfunction |
| EU | Limit/ decrease frequency due to high temperature of module |
| C5 | Malfunction protection of jumper cap |
| Fo | Gathering refrigerant |
| F1 | Indoor ambient temperature sensor is open/short circuited |
| F2 | Indoor evaporator temperature sensor is open/short circuited |
| F3 | Outdoor ambient temperature sensor is open/short circuited |
| F4 | Outdoor condenser temperature sensor is open/short circuited |
| F5 | Outdoor discharge temperature sensor is open/short circuited |
| F6 | Limit/ decrease frequency due to overload |
| F8 | Decrease frequency due to overcurrent |
| F9 | Decrease frequency due to high air discharge |
| FH | Limit/ decrease frequency due to antifreezing |
| PH | Voltage for DC bus-bar is too high |
| PL | Voltage of DC bus-bar is too low |
| P0 | Compressor Min frequence in test state |
| P1 | Compressor rated frequence in test state |
| P2 | Compressor maximum frequence in test state |
| P3 | Compressor intermediate frequence in test state |
| P5 | Overcurrent protection of phase current for compressor |
| PU | Charging malfunction of capacitor |
| P7 | Malfunction of module temperature sensor circuit |
| P8 | Module high temperature protection |
| H0 | Decrease frequency due to high temperature resistant during heating operation |
| H2 | Static dedusting protection |
| H3 | Overload protection for compressor |
| H4 | System is abnormal |
| H5 | IPM protection |
| H5 | Module temperature is too high |
| H6 | Internal motor (fan motor) do not operate |
| H7 | Desynchronizing of compressor |
| HC | PFC protection |
| L3 | Outdoor DC fan motor malfunction |
| L9 | Power protection |
| LP | Indoor unit and outdoor unit doesn't match |
| LC | Failure startup |
| U1 | Malfunction of phase current detection circuit for compressor |
| U3 | Malfunction of voltage dropping for DC bus-bar |
| U5 | Malfunction of complete units current detection |
| U7 | The four-way valve is abnormal |
| U9 | Zerocrossing malfunction of outdoor unit |
| U8 | Zero-crossing inspection circuit malfunction of the IDU fan motor |
Analysis or processing of some of the malfunction display:
- Compressor discharge protection
Possible causes: shortage of refrigerant; blockage of air filter; poor ventilation or air flow short pass for condenser; the system has noncondensing gas (such as air, water etc.); blockage of capillary assy (including filter); leakage inside four-way valve causes incorrect operation; malfunction of compressor; malfunction of protection relay; malfunction of discharge sensor; outdoor temperature too high. Processing method: refer to the malfunction analysis in the above section.
- Low voltage overcurrent protection
Possi ble cause: Sudden drop of supply voltage.
- Communication malfunction
Processing method: Check if communication signal cable is connected reliably.
- Sensor open or short circuit
Processing method: Check whether sensor is normal, connected with the corre sponding position on the controller and if damage of lead wire is found.
- Compressor over load protection
Possible causes: insufficient or too much refrigrant; blockage of capillary and increase of suction temp.; improper running of compressor, burning in or stuck of bearing, damage of discharge valve; malfunction of protector. Processing method: adjust refrigerant amount; replace the capillary; replace the compressor; use universal meter to check if the contactor of compress or is fine when it is not overheated, if not replace the protector.
- System malfunction
i.e.overload protection.When tube temperature(Check the temperature of outdoor heat exchanger when cooling and check the temperatur e of indoor heat exchanger when heating) is too high, protectionwill beactivated. Possi ble causes: Outdoor temperature is too high when cooling; insufficient outdoor air circulation; refrigerant flow malfunction. please refer to the malfunction analysis in the previous section for handling method .
- IPM module protection
Processing method:Once the module malfunction happens,if it persists for a long time and can not be selfcanceled, cut off the power and turn off the unit,and then re-energize the unit again after about 10 min.After repeating the procedure for sever times, if the malfunction still exists,replace the module.
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